CODEWITHSUNDEEP
pythonlz4
Waqas
Waqas

Reputation: 6802

Decompressing a content of unknown length with python-lz4

I am trying to decompress a content of unknown size using python-lz4 using the following code

with open("compressed.msgpk", "rb") as f:
    content = f.read()
    if content[0] == 1:
        uncompressed = lz4.block.decompress(content[1:])

but it always fails with

LZ4BlockError: Decompression failed: corrupt input or insufficient space in destination buffer. Error code: 58

I even tried specifying different/bigger sizes as shown here https://python-lz4.readthedocs.io/en/stable/lz4.block.html but nothing worked.

And if it help the content I am trying to decompress is compressed using lz4net c# library using method LZ4Codec.WrapHC(content) https://github.com/MiloszKrajewski/lz4net/blob/201ed085fed299523616bfd08776694cb61ae6b3/src/LZ4/LZ4Codec.cs#L562

Upvotes: 5

Views: 1761

Answers (1)

Haqa
Haqa

Reputation: 476

The unwrap method decodes a wrapped block, but the lz4.block.decompress method appears not to take wrapping into account.

I'm not 100% familiar with the python and c# libraries you are using but I wonder (from the docs) if the lz4.frame.decompress might be the method you are looking for?

Upvotes: 1

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